What should I do if water leaks at the junction between the tap switch and the wash basin?
Try adding two rubber gaskets to add:
1. You can try to change the spool by yourself. The cover on the handle can be pried open along the gap with a blade. After opening, there is a screw inside, loosen it with a screwdriver, and you can pull out the handle upwards. You can see a nut, use a wrench to remove it, you can take out the valve core, go to the plumbing parts store to buy exactly the same and put it back. The valve core is divided into two kinds of hot and cold water, red hot water and blue cold water. Don't install the wrong side.
2. Clean the connection between the switch and the wash basin, tighten the fastening screws, and then squeeze the glass glue on the connection, and use it when it is dry until it does not stick to your hands. The characteristic of glass glue is that it has a strong airtightness and is soft even if it dries. When it needs to be repaired in the future, it can be opened gently with a utility knife.

Finally, how to maintain the basin faucet, you can start from the following aspects:

(1) It is not necessary to close the faucet tightly: many people are accustomed to using some force to close the faucet tightly, which is very undesirable. This will not prevent water leakage, but will damage the sealing valve and cause the faucet to be closed. (2) Good habit to ensure completeness as new: Do not use excessive force to cause artificial damage when opening and using, and the surface of the faucet should be wiped clean after normal use. (3) When the water flow becomes smaller, it is necessary to remove impurities: if the water pressure is not lower than 0.02mpa, if the water output is found to be reduced, it may be blocked in the faucet. The solution is to use a wrench to gently unscrew the faucet screen cover at the water outlet of the faucet, clean the impurities and then install it carefully. Generally, it will be restored as before.
(4) The surface of the faucet should always be gently wiped with a soft cloth (without impurities) dipped in detergent. Avoid using metal filaments or scouring pads with hard particles. In addition, don't hit hard objects to damage the surface of the faucet. (5) Use the following cleaning agents to remove rough masks and accumulations: mild liquid glass cleaner, pure liquid glass cleaner, acid-free, no abrasive soft liquid or completely dissolved powder, non-friction solution polish . (6) Do not use any abrasive cleaner, cloth or paper cloth; do not use any acid-containing cleaner, polishing abrasive or rough cleaner.